Cherry and Brad C are 100% correct, but I just want to add that this is really a "run-on sentence" and needs to be corrected. Let me explain. There are two clauses: "form a union" and "an unorganized mob can accomplish only chaos." Each clause can be a complete sentence by itself: ("Form a union." and "An unorganized mob can accomplish only chaos.") In this situation, you cannot join the two clauses with a comma. You can either: 1. use a semicolon Form a union; an unorganized mob can accomplish only chaos. 2. add a word like "and," "but," "so," "because" Form a union, because an unorganized mob can accomplish only chaos. 3. make it into two sentences Form a union. An unorganized mob can accomplish only chaos.

This is one sentence consistent of 2 clauses. The main clause in the form of a command: Form a union! The second giving a reason for that command: because an unorganized mob can accomplish only chaos. Each clause ( the main and the subordiante have their own sentence components ( subject + predicate) and they are usually linked by a word ,you could use 'because' here or just leave it out !

Every sentence or every PHRASE should have one main verb. In your example, you have two phrases combining to make one sentence, but each phrase needs its own verb. This is very common (e.g., "Please drive to the store and buy some food.").

What an anal question. "we should form a union, because an un... chaos." You learnt this, you learnt that. But you forgot to learn you got a brain.